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by rasz 2571 days ago
Electro mechanical connection requires springiness action to be reliable - one side of the connector needs to work pushing pins together. In full size and mini USB elastic pins are inside sockets, plugs have rigid contacts

http://www.hobbytronics.co.uk/image/cache/data/rapid/mini-us...

Micro swaps that around, moving prone to failure (bend/pushed pin etc) elements into the cable.